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[linux-lvm] lvmconvert --merge fails to remove devices on rebbot



Hi,

I am on CentOS 6.2  (kernel-2.6.32-220.el6.x86_64.rpm,
lvm2-2.02.87-6.el6.x86_64.rpm). I am seeing an issue similar to
https://bugzilla.redhat.com/show_bug.cgi?id=651007 where I still have
snapshot lvs present after I merge them back into the origin devices.

The steps are :

- create snapshot
- lvconvert --merge (on open lv so that the merge will happen on next reboot)
- reboot
- after reboot the lvs have been restored to original, but 'lvs -a'
still shows snapshot lvs

I was seeing many I/O errors during bootup like are shown in comment
13 of https://bugzilla.redhat.com/show_bug.cgi?id=651402 . I disabled
dmraid on bootup and I no longer get these errors but the snapshot lvs
are still present after the merge has taken place.

lvchange --refresh will clear up the snapshot lvs.


I do notice that dracut is touching the lvs (the ones to be merged)
early in the boot process:

dracut: Scanning devices vda2  for LVM logical volumes vgroot/plat_root
dracut: inactive Original '/dev/vgroot/plat_root' [1.00 GiB] inherit
dracut: inactive Original '/dev/vgroot/plat_var' [1.00 GiB] inherit
dracut: inactive Original '/dev/vgroot/plat_usr' [4.00 GiB] inherit
dracut: inactive '/dev/vgroot/plat_tmp' [1.00 GiB] inherit
EXT4-fs (dm-2): orphan cleanup on readonly fs
EXT4-fs (dm-2): 1 orphan inode deleted
EXT4-fs (dm-2): recovery complete
EXT4-fs (dm-2): mounted filesystem with ordered data mode. Opts:
dracut: Mounted root filesystem /dev/mapper/vgroot-plat_root
SELinux:  Disabled at runtime.
type=1404 audit(1328721625.889:2): selinux=0 auid=4294967295 ses=4294967295
dracut:
dracut: Switching root
                Welcome to CentOS


Is there an issue with dracut accessing and mounting the root lv
(which was set to be merged on next activation) ?

Note: dracut version is dracut-004-256.el6.noarch.rpm


Thanks for any help!


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